ABOUT THE INTERNATIONAL CONCRETE ABSTRACTS PORTAL

  • The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.

International Concrete Abstracts Portal

Showing 1-5 of 71 Abstracts search results

Document: 

SP126-34

Date: 

August 1, 1991

Author(s):

N. A. Cumming, T. F. Rogers, and A. P. Joseph

Publication:

Symposium Papers

Volume:

126

Abstract:

The Arthur Laing Bridge was constructed in 1975. At a relatively early age of about 6 years it began to suffer damage due to corrosion of the deck reinforcement. A major rehabilitation and resurfacing program was implemented in 1987, which included the installation of a cathodic protection system on about 45 percent of the 21,200 mý deck. This is one of the largest installations of cathodic protection on a reinforced concrete bridge deck. The original deck was milled to a depth of 15 to 25 mm to remove chloride-contaminated concrete. A catalyzed titanium wire mesh anode system was installed on the milled surface after delaminations had been patched. Finally a 50 mm thick low-slump dense concrete overlay was placed. This paper describes the design and construction of the cathodic protection system. Technical details of the cathodic protection and overlay system and construction costs are also presented.

DOI:

10.14359/3790


Document: 

SP126-35

Date: 

August 1, 1991

Author(s):

K. Takewaka and T. Minematsu

Publication:

Symposium Papers

Volume:

126

Abstract:

The impressed current-type of cathodic protection was evaluated for controlling of marine concrete structures as follows: To establish criteria of cathodic protection on marine concrete structures, to develop a system that can distribute current uniformly to all reinforcement, and to investigate the over-protection problem that effects the bonding of reinforcement and durability of anode material. The application of the cathodic protection system for the rehabilitation of a harbor concrete structure in Japan was also examined.

DOI:

10.14359/3797


Document: 

SP126-23

Date: 

August 1, 1991

Author(s):

William e. Ellis, Jr., Eugene H. Riggs, and W. B. Butler

Publication:

Symposium Papers

Volume:

126

Abstract:

This research project was undertaken to determine the effect on the chloride permeability of concretes of increasing amounts of fly ash in low water-cementitious material ratio concrete as compared with comparable high-quality concretes containing combinations of portland cement, silica fume, and ground-granulated blast furnace slag. The test method utilized was the Rapid Determination of the Chloride Permeability of Concrete (AASHTO T-277). Fifteen superplasticized concrete mixtures were evaluated for compressive strength at ages of 28 and 56 days, and for chloride permeability at 56 days. The inclusion of fly ash, silica fume, and ground-granulated blast furnace slag all significantly reduced the chloride permeability of concrete as compared with concrete containing only portland cement. Increasing amounts of fly ash generally showed decreased permeability in the tests conducted.

DOI:

10.14359/2255


Document: 

SP126-08

Date: 

August 1, 1991

Author(s):

Tony C. Liu

Publication:

Symposium Papers

Volume:

126

Abstract:

Roller-compacted concrete (RCC) has been used by the U.S. Army Corps of

DOI:

10.14359/2086


Document: 

SP126-15

Date: 

August 1, 1991

Author(s):

Jahangir Mirza

Publication:

Symposium Papers

Volume:

126

Abstract:

Erosion by abrasion, cavitation and/or chemical attack in concrete hydraulic structures deteriorates spillways, stilling basins, chutes, slabs and transverse joints, concrete blocks under water gates, and any irregular surface subjected to high water flow rate. Countless overlays are commercially available for repairing deteriorated surfaces. However, the essential data provided by manufacturers is very limited and, even if it is available, it is normally limited to room temperature values. This persuaded the Canadian Electrical Association to support a comprehensive study on commercial overlays, especially from the viewpoint of resistance against erosion and the severe climatic conditions observed in northern parts of Canada. This paper presents laboratory test data on the erosion resistance and durability properties of various types of commercial overlays such as cementitious grouts, polymer-modified cement-based mortars, and epoxy mortars.

DOI:

10.14359/2169


12345...>>

Results Per Page